我想知道为什么管道可以使用的进程之间的关系在Linux API和Bash中是不同的.
>在Linux API中,未命名的管道(pipe())只能在父子进程之间使用.
>在Bash中,可以在两个进程之间使用管道,这两个进程将shell进程作为其共同父进程.
Bash中的管道是否根据Linux API中未命名的管道实现？谢谢.
来自APUE 3ed：
15.2 Pipes
Pipes are the oldest form of UNIX System IPC and are provided by all
UNIX systems. Pipes have two limitations.
Historically, they have been half duplex (i.e., data flows in only one direction). Some systems now provide full-duplex pipes, but for
maximum portability, we should never assume that this is the case.Pipes can be used only between processes that have a common ancestor. Normally, a pipe is created by a process, that
process calls fork, and the pipe is used between the parent and the
child.We’ll see that FIFOs (Section 15.5) get around the
second limitation, and that UNIX domain sockets (Section 17.2) get
around both limitations.…
15.5 FIFOs
FIFOs are sometimes called named pipes. Unnamed pipes can be used
only between related processes when a common ancestor has created the
pipe. With FIFOs, however, unrelated processes can exchange data.
解决方法:
- In Linux API, unnamed pipes (
pipe()) can be used only between parent-child processes.
不对.任何具有文件描述符的进程都可以使用它们：父进程,任何子进程,任何具有received them via domain sockets的进程等.
bash中的管道只是儿童与儿童交流的特定情况.
标签：c-3,bash,linux,shell,pipe 来源： https://codeday.me/bug/20190828/1750807.html
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